Free tool
Seller Finance Deal Calculator
Enter the terms a seller has quoted and see the estimated monthly principal and interest — plus what would still be owed if a balloon comes due. Start straight away; no email needed to run the numbers.
Estimated monthly principal & interest
Not enough stated terms to estimate a payment. Still needed: interest rate.
Amount financed: $146,300 · down payment 30.0% of price
Estimate only, based solely on what you entered. Not a quote or an offer of credit.
How to read these numbers
A seller-financed payment is calculated the same way a mortgage payment is: the amount financed, an interest rate, and an amortization schedule. What differs is that the schedule often does not run to the end. A 30-year amortization with a balloon in year five means the payment is small, but a large balance is still owed in year five.
So compare three things, not one: the monthly payment, the balloon balance and the date it is due. A lower payment with a short balloon can be riskier than a higher payment with none — and a rate that is never stated as a number is not a rate.
Common questions
- How is the monthly payment estimated?
- The calculator uses the standard amortizing payment formula on the amount financed, using the interest rate and amortization term you enter. It is an estimate of principal and interest only; taxes, insurance, HOA dues and fees are added separately if you enter them.
- What does the balloon estimate mean?
- If a balloon date is entered, the calculator shows the balance that would still be owed on that date assuming every scheduled payment is made on time and no extra principal is paid. That balance becomes due in full on the balloon date.
- What if the seller has not stated a rate or term?
- Then the calculator cannot produce a figure, and it will not invent one. A missing rate, term or balloon date is a term nobody has committed to yet — ask for it in writing before comparing deals.
- Are these numbers a quote?
- No. Everything shown is an estimate based only on the numbers you type in. It is not a quote, not an offer of credit, and not confirmation that any seller has agreed to those terms.
Own Ahead resources are educational only. They are not legal, tax, financial or real-estate advice, and they are not an offer of credit. Seller financing is not automatically cheaper, easier or safer than a traditional mortgage — terms vary widely and some are worse. Always have documents reviewed by a licensed attorney and a title or escrow company before you sign or send money.
The Seller Financing Buyer's Playbook
A practical walkthrough of how seller financing actually works, the 20 questions to ask before you agree to anything, and the due-diligence steps that protect you.
Get the PlaybookFree · educational only · no card needed